Earnings season continues in full force this week as nearly one-third of the Standard & Poor's 500, or about 160 companies, are due to report results, including social media giants Facebook Inc., Twitter Inc. and LinkedIn Corp. Analysts now expect overall earnings from S&P 500 companies to dip 0.3 percent, compared with the 3 percent decline expected at the start of July, according to Thomson Reuters data. About 200 companies in the S&P 500 have reported earnings so far, and...